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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #box {
            width: 100px;
            height: 100px;
            border: 1px solid black;
        }
    </style>
</head>

<body>
    <div id="box"></div>

    </script>

</body>

</html>